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N. DORPMAN.

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APPLICATION IILED JUNE 4, 1012.

1,051,707. I I Patented Jan. 28, 1913.

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APPLICATION FILED JUNE4,1912.

1,051,707. Patented Jan. 28, 1913.

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APPLICATION FILED 311N114, 1912. 1,051,707. Patented Jan 28, 1913.

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'I call a round locked and alarm lock and which is adapted to be used ona safe door UNITED STATES PATENT OFFICE.

NATHAN DORFMAN, OF CHICAGO, ILLINOIS.

Specification of Letters Patent.

Patented Jan. 28,1913.

Application filed June 4, 1912. Serial No. 701,622.

To all whom it may concern lowing is a specification.

This invention is an improved lock, which or a door of any kind, tooperate a number of bolts at different points at the sides of the 'door,the invention consisting in the construction, combination andarrangement of devices hereinafter described and claimed.

the lock, the door and the door frame, the door frame being indicated insection and the cover of the lack being removed so as to disclose thelnterlor mechanism of the lock.

Fig. 2. Fig. 4 is a View similar to Fig. 2,

showing the lock with its parts in unlockedf Fig. 5 is a detailtransverse secposition. tional view of the guide.

For the purposes of this specification a door is indicated at 1. Inpractice, this may be a safe door or the door of a house, store,warehouse or door of any kind and my improved lock is adapted for use inconnection with any kind of a door. On the inner side of the door at thecenter of the same is a lock case 2 which is circular in form andcomprises a base plate 3 which may be attached to the door by anysuitable means and a cover 4., the cover being here shown as hinged atone side as at 5. This plate has a key hole 6 and on the inner side ofthe base plate, and concentric with the case 2 is a bolt actuatingelement 7 which is here shown as comprising an annular connecting member8 and a nearly circular key engaging member 9, the said key engagingmember being concentrically arranged in the connecting member 8 anddetachably secured thereto by means of a segmental projection 10 whichfits in a correspondingly shaped recess 11 in one side of the connectingmember 8. The pivot for the key engaging member and the connecting Fig.3 is a sectional view of the same 1 on the plane indicated by the line33 of 1 dicated at 12. The key engaging member only partially fills theconnecting member so that a chamber or space 13 is provided betweenopposing sides of the key engaging member and the connecting member forthe operation of the wing or ward of the key. The key engaging memberhas a notch 14 at one side of the said chamber for engagement by theward of the key, so that when the key is turned in one direction or theother it correspondingly moves the bolt actuating element and causes thelatter to describe a partial revolution. The extent of revoluble orangular movement of the bolt actuating element is controlled by stops 15which operate in segmental slots 16 with which the connecting member isprovided, the said stops projecting from the inner side of the base ofthe casing. The key engaging member is also provided with a slot 17 inwhich is a stop 18 which projects from the inner side of the base of thecasing. The key engaging member also has a controlling stop 19 whichprojects therefrom.

A stud 20 projects from the inner side of the base of the lock case andoperates in a slot 21 with which the key engaging member 9 is provided.This stud forms the pivot for a detent plate 21. The said detent plateis here shown as substantially triangular and with a curved recess 22 inits base, the lower side of the base of the detent plate partiallycovering the chamber formed between the key engaging member andconnecting member of the bolt actuating element. This detent plate has aslot 23 to clear the pivot of the bolt actuating element and throughwhich the said pivot projects, and also has a slot 24 to clear the stop18 and a segmental slot 25 in which the controlling stop 19 operates,the said slot 25 being arranged reversely of the slot 17 A spring 26bears at an intermediate portion of the stud and has one end connectedto a stud 27 which projects from the detent plate and the other end ofthe said spring bears against the stop 18. The function of this springis to normally hold the detent plate in place with the controlling stopin one end or the other of the slot 25 so that the detent plate preventsthe turning or partial turning of the bolt actuating element except byan appropriate key.

When an appropriate key is placed in the key hole and partly turned, itsward which engages the recess 14c of the key engaging member also bearsagainst the curved edge of the lower end of the detent plate formed bythe recess 22 so that a partial turning of the key raises the detentplate or partly turns it on its pivot at the same time as the key by itsengagement with the notch 14 partly turns the bolt actuating element andas the key moves past the center the spring 26 returns the detent plateto its normal position with the controlling stop in the opposite end ofthe slot 25, as will be understood. The key engaging member beingdetachable from the connecting member of the bolt actuating element maybe constructed for operation and engagement by any kind of key and,hence, my lock may be adapted to be operated by many different forms ofkey desired by merely changing the key engaging member.

I also provide a suitable number of substantially radial bolts 28 whichare arranged in suitable guides 29 at the sides of the door or lookcase, as the case may be. Any suitable number of these bolts may beprovided according to the size of the lock and the size and nature ofthe door. I also provide link levers 30 which correspond in number withthe bolts. These link levers are arranged in the lock case and arepivotally mounted as at 31, the pivots of the link levers beingconcentric with the bolt actuating element. Each one of these linklevers has a slot 32 near its inner end which is engaged by a cam stud33 which projects from one side of the connecting member 8 of the boltactuating element, the outer end of each link lever being connected asat 34 to the inner end of one of the bolts. At the sides of the dooropening are keepers 35 which receive the bolts when the latter areprojected outwardly by the operation of the bolt actuating element andthe link levers. When the bolt actuating element is turned in thereverse direction by the key these bolts are drawn inwardly to disengagethe to move the detent in one direction when re 1 leased by the key.

2. In a lockof the class described, the combination of a base, a boltactuating element pivotally mounted on the base for partial rotation andcomprising a connecting member and a key engaging member, a series ofbolts, a series of pivotally mounted link levers each having a slot atone end engaged by a pin projecting from the connecting member, theouter end of said link levers being pivotally connected to said bolts,and a spring actuated detent to prevent casual turning of the boltactuating element.

In testimony whereof afliX my signature 1 in presence of two witnesses.

NATHAN DORFMAN.

Witnesses:

SoLoMoN TABACHNIK, HARRY A. PoLIsHUK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

